box (the container) / tin, can / Ellipsis of boîte de nuit.: club, nightclub / company, employer

post office box (uniquely addressable lockable box located on the premises of a post office that may be hired as collection point for mail)

(Internet) outbox

answering machine (machine used in coordination with a telephone to record and replay voicemail) / voicebox (larynx)

can opener

(automotive) boîte de vitesses à variation continue — continuously variable transmission

(automotive) boîte de vitesses automatique — automatic transmission

(automotive) boîte de vitesses manuelle — manual transmission

matchbox

(aviation) black box (data recorder of an aircraft)